# Index of /obsolete/macros/latex/exptl/si

----------------------------------------------------------------
The si package --- A comprehensive (SI) units package
Maintained by Joseph Wright
E-mail: joseph.wright@morningstar2.co.uk
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
----------------------------------------------------------------
Typesetting values with units requires care to ensure that the
combined mathematical meaning of the value plus unit combination is
clear. In particular, the SI units system lays down a consistent
set of units with rules on how these are to be used. However,
different countries and publishers have differing conventions on
the exact appearance of numbers (and units). A number of LaTeX
packages have been developed to provide consistent application of
the various rules: SIunits, sistyle, unitsdef and units are
the leading examples. The numprint package provides a large number
of number-related functions, while dcolumn and rccol provide tools for typesetting tabular numbers.
The si package takes the best from the existing packages, and
adds new features and a consistent interface. A number of new
ideas have been incorporated, to fill gaps in the existing
provision. The package also provides backward-compatibility with
SIunits, sistyle, unitsdef and units. The aim is to have one
package to handle all of the possible unit-related needs of LaTeX
users.